Last summer, we learned that Facebook’s NYC team would be leaving its Madison Ave. office for a Frank Gehry-designed space in Astor Place’s 770 Broadway building. Though the construction is still underway, Facebook employees today began conducting business in the new office, an email announcement said. Housed in the same building as other media companies like AOL, Adweek, Backstage and Billboard, Facebook NY will officially open its doors later this spring, when the renovation is totally complete. “Today, Facebook New York begins our first day of business at our new offices at 770 Broadway,” Serkan Piantino, Site Director at Facebook New York, wrote in a blog post. “We’re excited to join the Astor Place neighborhood and continue to invest in the great tech community here.